Ultrasonic Attenuation in Ge–Si Alloys
- 1 August 1967
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 38 (9), 3777-3780
- https://doi.org/10.1063/1.1710210
Abstract
Measurements of the ultrasonic attenuation of 0.64‐ and 3.1‐GHz compressional waves in Ge–Si alloys show a decrease in the attenuation with alloying. Simple theory predicts that the ultrasonic attenuation of compressional waves in insulators is proportional to thermal conductivity. In Ge–Si alloys, there is a large reduction in the thermal conductivity with alloying. However, the observed reduction in attenuation is appreciably smaller than the decrease in thermal conductivity. When the Ge–Si alloys are doped with Fe beyond the solubility limit, a peak in the attenuation‐vs‐temperature curve is observed at low temperatures. This peak is attributed to the presence of excess Fe, which is precipitated out in planes arranged in a near‐periodic fashion.Keywords
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